One of the problems with finding interior parts for crew cabs is that many of them are CC specific. The headliner is bad in mine, but I want to have a set of spare pieces before I start taking things apart.
The other issue is that there are way fewer CC's out there to begin with, than regular cabs, ex cabs, or Burbs and Tahoes/Yukons. In '97 the production figure on my truck (C3500 CCLB) is a little bit more than 15,000. Compare that to the number on my '99 Burb(over 271K). Granted, the '99s ran longer than usual, to use up the old body style parts before the 2000 Burbs came out as the NBS/800 series.